/Engine/Source/Runtime/CoreUObject/Public/UObject/PackageTrailer.h
Creates a builder from a pre-existingFPackageTrailer. Payloads stored locally in the source trailer will be loaded from disk via the provided archive so that the builder can write them to any future trailer that it creates.
static [FPackageTrailerBuilder](API\Runtime\CoreUObject\UObject\FPackageTrailerBuilder) CreateFromTrailer ( const class [FPackageTrailer](API\Runtime\CoreUObject\UObject\FPackageTrailer) & Trailer, [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar, [FString](API\Runtime\Core\Containers\FString) DebugContext )